Clearly written and illustrated with 380 black and white photos and drawings, this dictionary covers all the major fields of science in 8,500 entries, from the fundamentals of chemistry, physics, biology, and mathematics to the applied realms of medicine, ecology, and computer science. Key concepts like relativity, genetic sequencing, and plate tectonics are further explained in 175 notes accompanying the entries, and the book includes 320 biographies of notable scientists.